Thanks Tim, I've talked to several people that have them, but haven't run them, or people that want to try them, but no one that has put effort into them (maybe they're not talking?). It's an appealing option to me, I've been running the 11.5 treads at Dixon speedway, and love them through the center of the corner, power delivery is hurting me center off, but that's another story.
I like the fact that they give about 1/2" more ground clearance, especially being a bigger guy and running a #430 kart, if the track is the slightest bit rough and Im on a 34" tire I spend more time with the frame rails on the ground than the tires...